Jorgensen 2-Pack 4" Light Duty Steel Bar Clamp Set 300 Lbs Load Limit Bar Clamps

Sliding head design makes this style fast acting: the sliding head is threaded to accommodate the screw with large easy grip handle and swivel pad. Multiple-Disc-Clutch design consist hardened plated steel clutch disc and one spring which allows the sliding head to hold securely at any point along the bar.